Исходники и презентации

lessons/interfaces/interface_implementation/main.go

@@ -0,0 +1,51 @@
+package main
+
+import "fmt"
+
+type Square struct{}
+
+func (s *Square) Area() float64 {
+	return 0.0
+}
+
+func (s *Square) Perimeter() float64 {
+	return 0.0
+}
+
+const (
+	AreaMethod = iota
+	PerimeterMethod
+)
+
+type Interface struct {
+	methods [2]func() float64
+}
+
+func NewInterface(square *Square) Interface {
+	return Interface{
+		methods: [2]func() float64{
+			AreaMethod:      square.Area,
+			PerimeterMethod: square.Perimeter,
+		},
+	}
+}
+
+func (i *Interface) Area() float64 {
+	return i.methods[AreaMethod]()
+}
+
+func (i *Interface) Perimeter() float64 {
+	return i.methods[PerimeterMethod]()
+}
+
+func main() {
+	// static dispatch
+	square := &Square{}
+	fmt.Println(square.Area())
+	fmt.Println(square.Perimeter())
+
+	// dynamic dispatch
+	iface := NewInterface(square)
+	fmt.Println(iface.Area())
+	fmt.Println(iface.Perimeter())
+}